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This exception has no message.
java.lang.NullPointerException: 	at serp.util.SimpleLinkedList.removeLast(SimpleLinkedList.java:181)	at serp.util.SimpleLinkedList.removeEntry(SimpleLinkedList.java:125)	at serp.util.OrderedSet.remove(OrderedSet.java:232)	at serp.util.LRUMap.remove(LRUMap.java:180)	at com.solarmetric.kodo.util.CacheMap.flush(CacheMap.java:183)	at com.solarmetric.kodo.util.CacheMap.put(CacheMap.java:220)	at com.solarmetric.kodo.runtime.datacache.plugins.LocalCache.put(LocalCache.java:114)	at com.solarmetric.kodo.runtime.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:264)	at com.solarmetric.kodo.runtime.StateManagerImpl.loadInitialState(StateManagerImpl.java:174)	at com.solarmetric.kodo.runtime.PersistenceManagerImpl.getObjectByIdFilter(PersistenceManagerImpl.java:986)	at com.solarmetric.kodo.runtime.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:905)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.createFromResultSet(JDBCStoreManager.java:772)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager$2.getResultObject(JDBCStoreManager.java:727)	at com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.instantiateRow(LazyResultList.java:177)	at com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.get(LazyResultList.java:139)	at java.util.AbstractList$Itr.next(AbstractList.java:416)	at com.solarmetric.kodo.runtime.objectprovider.ResultListIterator.next(ResultListIterator.java:49)	at serp.util.LookaheadIterator.setNext(LookaheadIterator.java:133)	at serp.util.LookaheadIterator.next(LookaheadIterator.java:58)	at serp.util.MultiIterator.next(MultiIterator.java:33)	at com.solarmetric.kodo.runtime.ExtentImpl$TransactionAwareIterator.next(ExtentImpl.java:227)	at com.solarmetric.kodo.query.QueryImpl.execute(QueryImpl.java:857)	at com.solarmetric.kodo.query.QueryImpl.executeWithMap(QueryImpl.java:818)	at com.solarmetric.kodo.query.QueryImpl.execute(QueryImpl.java:595)	at com.ewarna.pdm.sessions.BasicQuery.getByAdvancedFormula(BasicQuery.java:144)	at com.ewarna.pdm.sessions.BasicQuery.getByAdvancedFormula(BasicQuery.java:65)	at com.ewarna.pdm.sessions.BasicQuery.getByAdvancedFormula(BasicQuery.java:52)	at com.ewarna.handlers.storage.SharedInfoHandler.getSharedFolder(SharedInfoHandler.java:448)	at com.ewarna.handlers.storage.SharedInfoHandler.getSharedFolder(SharedInfoHandler.java:385)	at com.ewarna.handlers.storage.SharedInfoHandler.shareEntity(SharedInfoHandler.java:220)	at com.ewarna.handlers.storage.SharedInfoHandler.access$300(SharedInfoHandler.java:44)	at com.ewarna.handlers.storage.SharedInfoHandler$2.execute(SharedInfoHandler.java:171)	at com.ewarna.pdm.sessions.JDOCallBackExecutor.execute(JDOCallBackExecutor.java:40)	at com.ewarna.handlers.storage.SharedInfoHandler.shareEntity(SharedInfoHandler.java:193)	at com.ewarna.pdm.soap.sharing.SoapShareImpl.shareFolder(SoapShareImpl.java:154)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.apache.soap.server.RPCRouter.invoke(RPCRouter.java:146)	at org.apache.soap.providers.RPCJavaProvider.invoke(RPCJavaProvider.java:129)	at org.apache.soap.server.http.RPCRouterServlet.doPost(RPCRouterServlet.java:354)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)	at java.lang.Thread.run(Thread.java:536)